Where to buy PS1/PS2 titles?

Hello everyone,
I'm looking for an online store which sells original, unused PS1 and PS2 titles. I have a backwards-compatible PS3 and I'm kinda collecting games like a hamster
The thing is, I'm from Croatia, and around here there aren't any stores which sell those old games any more. Sometimes I buy games from eBay, but it's a rare occasion to find an unused PAL game. So I have decided to try to ask here.
I don't know if this is against the terms of service of this forum, if it is I'm terribly sorry.
Any advice would be most appreciated

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